from django.contrib.auth import get_user_model
from django.shortcuts import get_object_or_404, render
from django.utils.translation import ugettext as _

from misago.core.exceptions import Banned
from misago.users.bans import get_user_ban
from misago.users.decorators import deny_authenticated, deny_banned_ips
from misago.users.tokens import is_activation_token_valid


UserModel = get_user_model()


def activation_view(f):
    @deny_authenticated
    @deny_banned_ips
    def decorator(*args, **kwargs):
        return f(*args, **kwargs)

    return decorator


@activation_view
def request_activation(request):
    return render(request, 'misago/activation/request.html')


class ActivationStopped(Exception):
    pass


class ActivationError(Exception):
    pass


@activation_view
def activate_by_token(request, pk, token):
    inactive_user = get_object_or_404(UserModel, pk=pk, is_active=True)

    try:
        if not inactive_user.requires_activation:
            message = _("%(user)s, your account is already active.")
            raise ActivationStopped(message % {'user': inactive_user.username})

        if not is_activation_token_valid(inactive_user, token):
            message = _(
                "%(user)s, your activation link is invalid. "
                "Try again or request new activation link."
            )
            raise ActivationError(message % {'user': inactive_user.username})

        ban = get_user_ban(inactive_user)
        if ban:
            raise Banned(ban)
    except ActivationStopped as e:
        return render(request, 'misago/activation/stopped.html', {
            'message': e.args[0],
        })
    except ActivationError as e:
        return render(
            request,
            'misago/activation/error.html',
            {
                'message': e.args[0],
            },
            status=400,
        )

    inactive_user.requires_activation = UserModel.ACTIVATION_NONE
    inactive_user.save(update_fields=['requires_activation'])

    message = _("%(user)s, your account has been activated!")

    return render(
        request, 'misago/activation/done.html', {
            'message': message % {
                'user': inactive_user.username,
            },
        }
    )
